Lock



Jan. 22, 1929. 1,699,734

c.- A. cRENsHAw LOCK Filed Aug. 25. 1927 99 ff 99h49 Patented .lam 22, ,1929;

unirse stares PATENT lih'lCE.`

LOCK.

application inea august 23, 1927. serial No. 214,812.

My invention relates to locks and has for its object to provide a new and etlicient lock for use in `locking dwelling doors or other doors or closures where it is desired to keep mavauders or intruders from entering without the permission ofthe owner.

A. further object is to provide a lock which will be etlicient at all times and one which will not wear out from continued service over a long period of time. i

A still further object is to provide a lock which will be burglar proof and one which can be locked from within the house and can not be opened from without under any ein f' cumstances, even with the correct key.

These objects I accomplish with the device illustrated in the accompanying drawings, in which similar numerals and letters of reference indicate like parts throughout the several views and as described in the specification forming a part of this application and pointed out in the appended claims.

ln the drawings, in which I have shown the best and most preferred manner of build ing my invention, Figure 1 is a plan view of the lock. Figure 2 is a vertical section on line 2 2 of Figure 1. Figure 3 is a view of the casting forming the interior of the lock.

Figure 4iis a view of the central sha-ft of the lock.

ln the drawings, in which l have shown the best and most economical manner of constructing my invention, I have shown the cylinder in which the working parts of my invention are carried as A, with the handles or knobs as B. l provide short bosses or rods l radiating diainetrically from said knobs by which the knobs may be turned when opening the door' and which knobs are so placed so that the door may be opened when the hands are wet, soapy or slippery from grease or other sources` A central shaft 2 is provided, running from end to end of the cylinder A and into the knobs, which are secured thereto by the screws 8 which are placed in each end of the knobs and which screw into threaded holes in the eX- treme ends of the shaft 2. The said shaft 2 has a gear wheel a formed medially thereon, which gear wheel meshes with teeth 5 on a plunger G. The plunger 6 is the means of locking the door and is adapted to have one end beveled at and to t into any of the `common types of sockets secured in the door frame. Keys 8 are placed in keyways provided in the knobs and the ends of the shaft 2 to prevent slipping of the knobs on the shaft. A spring member 9 is secured on the said shaft by pins 10 and a spring stop 11 is secured to the outer `cylindrical casing A bv which the spring is stopped from turning in. either direction when the handle is being' turned. The spring 5) is a coil spring and is carried between spring hinges 12 and 13, which hin ges have one end of the spring engaged over each one so that the shaft may be turned in either direction as desired but will still have spring pressure to return it to normal position and thestop 11 will hold the spring and the shaft in normal position at all times except when the knobs are turned and will always return the knobs and the shaft to the original normal starting position. il beveled ring 1st is provided between the knob B on one end and the end of the cylinder A and is flanged at 15 and secured to the shaft 2, with `a lio-le 16u therein in which the ta pered end of a sliding plunger 16 is passed when locking `the door. A casting member 17 `is provided within the said casing A and is provided with a central bore `18 therethrough, which bore is larger at one end than at the other,`as at19. The said enlarged bore 19 is surrounding the gear wheel 4` on the shaft 2, and the casting is secured in the said cylinder A by the screw 20. Two sides 21 and 22 of the said casting 17 are `milled flat, as shown in `Figure 3, and a spring shaft 23 is secured therein on one side only. A spring engaging fork 211 is then secured to the plunger rod 16 by the rivet 25. The spring 2t? is then placed over the shaft 23 and is the means of moving the plunger rod 16 into the hole 16a when the rod is released. A milled slot 27 is cut in the top side of the plunger rod 16 and an. outside lock plunger bolt 28 is carried therein, with an offset 29 on one side of said bolt 28 which is to be moved by the key to the lock, and which is slidable in the groove 30 in the side of the slot 27. Theend of the said bolt 28 is tapered and is adapted to fit into a hole 31 in a beveled ring 32, which ring 32 is carried between the knob B and the other end of the cylinder A. The said ring 32 has a cylindri cal member 33 formed on the p inner side thereof through which the shaft 2 is passed in a hole 3a, and the end of the cylindrical member 33 has a thread 35 formed thereon adapted to engage with a lug 36 formed on the bottom side of the free end of the plunger rod 16 to move the said rod longitudinally (llt with the rotation of the ring 32to disengage the loehing end oi the said plunger from the `hole lG when the person is entering the house from without. A key hole 38 is provided through the side of the Cylinder A and a key 39 is carried therein supported on the lower side by a bracket 40, which bracket is secured to the casting 17. T he outer end of the key 39 ie squared to fit any desired key and a boss 4:1 is providedbelow the cylindrical easing A adapted to engage with the oilset 29 to disengage the looking bolt 28 from the hole 3l. A epring' 123 is secured to the easing A by the rivets 114 and: the end oit which ie engaged in a hole 415 provided in an offset e6 near the end of the plunger bolt 28. Said spring ie provided to move the holt longitudinally to lock the. door. The plone-- er 1 has a hrg 49' formed' on the top side thereof and the collar 111 has a catch lug 50 formed on one Side thereof adapted 'to engage with Said lug L9 to lool; the movement ot' any ot' the parte of the lock. y

The operation oli my lock ie as follows To lool; the door the plonger 6 is placed in the door socket and the plunger 28 is in the hole 31 which holds the door looked from Without The siluring 9 normally holds tllieplnnger 6 in the socket oit the doorV and to; Withdraw the plunger-1 to open the door the knobs B must be. rotated compressing the Spring' lont Withdrawn]gr the plunger. The moment that the knohs are released the spring.` again iiorces the plnnger' out into the socket ii' the door closed` or into the open nii` if the door is open. Tov open the door from outside: the key is placed over the top of the `hey-.r 39 andthe key turned. This plaees thev memberlfl against the lug 29 and when turnedi moves the plonger E28/longitudinally, releasing the lock anch allowing the knob to be turned? and the door opened. When thel door is again closed it automatically locks itself by the action of the spring 26 amt the fork 24. To lock the door at night to ln'event any one from: enteringduiring the night, the ring collar 14 is rotated until the plunger 16 has moved into the hole 1oa and the lug 5() is engaged over the lug 49 which locks the door trom any one entering `from Without, Whether he has the correct key or not. To releee the lock the Collar ring; 1/1 is turned in Ythe opposite direction until the plunger is free oit the hole 1(51. The door may then e opened.

l'lavinp; thus described my invention l desire to Secure by Letters` Patent and elaim 1. In a door lock the eomloimttion of i a cylindrical casingna central Shaft thereltlrronggh; a collar over each eind ort' eaid easing, there being` a hole in eaeh collar adapted to have a plunger paseed therlzin; enacting piangere carried one Within the other within said casing; Springe to aetnate eaizfl planners independently; means tol actuatel said plungere hy a key; a knoh on each end of said central shaft; a spring; member on said central shaft to allow Said ehatt to rotate partially in either direction; a gie-ar Wheel on said shaft; a plunger 6 having' `Lgear teeth thereon adapted to lit the teeth ot nai-d gear and to ineen therein; and a casting within Said cas img in which the Shaft and parte are carried and operated.

2. In a door lock the combini-itin-ni oi" a Cylindrical casing; a caeti-ngg Within` ,aid cas-` ing; a Central shaft through said casing; and Casting; a gear Wheel on Said caetingg; a plunger having;r 'teeth thereon operable at right angles to said shaiit; coact-ing plungere one within the other carried in Said caetiiig and controlled by separate springe; a `ci' 'l spring to Control the movement of said shaft;` collars over tlmM end ot said easing having plunger holes therein in which said coaching plungere are placed when the door ie locked;` and: means to move and control the movement of said plungers ae` desinedr Ln testimony whereoil I have affixed my Signature- @@LMAN A. CRENSHAW.

Gti 

